mirror of https://github.com/PentHertz/srsLTE.git
192 lines
5.5 KiB
C
192 lines
5.5 KiB
C
/*
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* Copyright 2013-2020 Software Radio Systems Limited
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*
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* This file is part of srsLTE.
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*
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* srsLTE is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, either version 3 of
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* the License, or (at your option) any later version.
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*
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* srsLTE is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* A copy of the GNU Affero General Public License can be found in
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* the LICENSE file in the top-level directory of this distribution
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* and at http://www.gnu.org/licenses/.
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*
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*/
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#include <math.h>
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#include <signal.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <strings.h>
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#include <time.h>
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#include <unistd.h>
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#include "srslte/phy/io/filesink.h"
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#include "srslte/phy/rf/rf.h"
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#include "srslte/phy/ue/ue_mib_nbiot.h"
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#include "srslte/phy/ue/ue_sync_nbiot.h"
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#include "srslte/phy/utils/debug.h"
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static bool keep_running = true;
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char* output_file_name = NULL;
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char* rf_args = "";
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float rf_gain = 60.0, rf_freq = -1.0;
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int nof_prb = 6;
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int nof_subframes = -1;
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void int_handler(int dummy)
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{
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keep_running = false;
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}
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void usage(char* prog)
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{
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printf("Usage: %s [agrtnv] -f rx_frequency_hz -o output_file\n", prog);
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printf("\t-a RF args [Default %s]\n", rf_args);
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printf("\t-g RF Gain [Default %.2f dB]\n", rf_gain);
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printf("\t-n nof_subframes [Default %d]\n", nof_subframes);
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printf("\t-v verbose\n");
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}
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void parse_args(int argc, char** argv)
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{
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int opt;
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while ((opt = getopt(argc, argv, "agnvfto")) != -1) {
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switch (opt) {
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case 'o':
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output_file_name = argv[optind];
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break;
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case 'a':
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rf_args = argv[optind];
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break;
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case 'g':
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rf_gain = strtof(argv[optind], NULL);
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break;
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case 'f':
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rf_freq = strtof(argv[optind], NULL);
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break;
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case 'n':
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nof_subframes = (int)strtol(argv[optind], NULL, 10);
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break;
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case 'v':
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srslte_verbose++;
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break;
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default:
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usage(argv[0]);
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exit(-1);
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}
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}
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if (&rf_freq < 0 || output_file_name == NULL) {
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usage(argv[0]);
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exit(-1);
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}
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}
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int srslte_rf_recv_wrapper(void* h, void* data, uint32_t nsamples, srslte_timestamp_t* t)
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{
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DEBUG(" ---- Receive %d samples ---- \n", nsamples);
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return srslte_rf_recv(h, data, nsamples, 1);
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}
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int main(int argc, char** argv)
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{
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signal(SIGINT, int_handler);
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parse_args(argc, argv);
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srslte_filesink_t sink;
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srslte_filesink_init(&sink, output_file_name, SRSLTE_COMPLEX_FLOAT_BIN);
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printf("Opening RF device...\n");
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srslte_rf_t rf;
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if (srslte_rf_open(&rf, rf_args)) {
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fprintf(stderr, "Error opening rf\n");
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exit(-1);
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}
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sigset_t sigset;
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sigemptyset(&sigset);
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sigaddset(&sigset, SIGINT);
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sigprocmask(SIG_UNBLOCK, &sigset, NULL);
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printf("Set RX freq: %.6f MHz\n", srslte_rf_set_rx_freq(&rf, 0, rf_freq) / 1000000);
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printf("Set RX gain: %.1f dB\n", srslte_rf_set_rx_gain(&rf, rf_gain));
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int srate = srslte_sampling_freq_hz(nof_prb);
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if (srate != -1) {
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printf("Setting sampling rate %.2f MHz\n", (float)srate / 1e6);
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double srate_rf = srslte_rf_set_rx_srate(&rf, srate);
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printf("Actual sampling rate %.2f MHz\n", srate_rf / 1e6);
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// We don't check the result rate with requested rate
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} else {
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fprintf(stderr, "Invalid number of PRB %d\n", nof_prb);
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exit(-1);
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}
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srslte_rf_start_rx_stream(&rf, false);
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srslte_nbiot_cell_t cell = {};
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cell.base.nof_prb = nof_prb;
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cell.base.nof_ports = 1;
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cf_t* buff_ptrs[SRSLTE_MAX_PORTS] = {NULL, NULL, NULL, NULL};
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buff_ptrs[0] = srslte_vec_cf_malloc(SRSLTE_SF_LEN_PRB_NBIOT * 10);
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srslte_nbiot_ue_sync_t ue_sync;
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if (srslte_ue_sync_nbiot_init(&ue_sync, cell, srslte_rf_recv_wrapper, (void*)&rf)) {
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fprintf(stderr, "Error initiating ue_sync\n");
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exit(-1);
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}
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int32_t nof_warmup_subframes = 1024;
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uint32_t subframe_count = 0;
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bool start_capture = false;
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bool stop_capture = false;
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while ((subframe_count < nof_subframes || nof_subframes == -1) && !stop_capture) {
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int n = srslte_ue_sync_nbiot_zerocopy_multi(&ue_sync, buff_ptrs);
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if (n < 0) {
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fprintf(stderr, "Error receiving samples\n");
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exit(-1);
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}
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if (n == 1) {
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if (!start_capture) {
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if (nof_warmup_subframes <= 0) {
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if (srslte_ue_sync_nbiot_get_sfidx(&ue_sync) == 9) {
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printf("Starting capture ..\n");
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start_capture = true;
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}
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}
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nof_warmup_subframes--;
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} else {
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printf("Writing subframe %d (%d/%d) to file (cfo=%6.2f kHz)\n",
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srslte_ue_sync_nbiot_get_sfidx(&ue_sync),
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subframe_count,
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nof_subframes,
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srslte_ue_sync_nbiot_get_cfo(&ue_sync) / 1000);
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srslte_filesink_write(&sink, buff_ptrs[0], SRSLTE_SF_LEN_PRB(nof_prb));
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subframe_count++;
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}
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}
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if (!keep_running) {
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if (!start_capture || (start_capture && srslte_ue_sync_nbiot_get_sfidx(&ue_sync) == 9)) {
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printf("Stopping capture ..\n");
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stop_capture = true;
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}
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}
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}
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srslte_filesink_free(&sink);
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srslte_rf_close(&rf);
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srslte_ue_sync_nbiot_free(&ue_sync);
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printf("Ok - wrote %d subframes\n", subframe_count);
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exit(0);
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}
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